Shuttle-carrier for sewing machines



June 16, 1936. J. F. 1... GIRAUD "SHUTTLE CARRIER FOR SEWING MACHINES Filed Oct. 51, 1933 2 Sheets-Sheet 1 INVENTOR June 1936- J. F. GIRAUD SHUTTLE CARRIER FOR SEWING MACHINES Filed Oct. 51, 1933 2 Sheets-Sheet 2 INVENTOR JULES FRANCO/5 LEON GIRAUD mmyfl ATTORNEY Patented June 16, 1936 UNITED STATES NT OFFICE SHUTTLE-CARRIER FOR SEWING MACHINES Jules Francois Lon Giraud, Digne, France 15 Claims.

The present invention has for its object an improved shuttle-carrier for sewing machines adapted to eliminate the shocks which take place between the shuttle and the shuttle-carrier, be-

tween the shuttle and the needle-plate or the guides, and in the machines with cylindrical shuttles, between the spindle and the shuttle-carrier.

In conformity with the invention, the shuttlecarrier is provided, on the side next the rear end of the shuttle, with an elastic push-piece which constantly pushes the point of the shuttle between the guide and an elastic stop, mounted on the shuttle-carrier, on the side next the point of the shuttle.

The elastic push-piece may consist of a buffer which is slidable in the shuttle-carrier and by which the shuttle is guided, a coiled spring being interposed between the buffer and the shuttlecarrier.

In one form of construction, the elastic stop against which the shuttle is pushed by the abovementioned push-piece, consists of a roller which is secured, directly or not, to the shuttle-carrier.

In another form of construction, the elastic 25 stop against which the shuttle is pushed by the said elastic push-piece consists of one or two buffers which are slidable in the shuttle carrier, the buffer or buffers being subjected to the action of a spring which pushes it towards the guide.

Owing to the aforesaid devices, the shuttle will always be held, without play, and hence without shocks, against the guide.

Further improvements will be shown in the fol lowing description.

In the accompanying drawings which are given by way of example:

Fig. 1 is a plan view of a shuttle-carrier for a vibrating machine with cylindrical shuttle, improved in conformity with the invention.

Fig. 2 is a front view of the same.

Fig. 3 is a horizontal section of the shuttle-carrier, the shuttle and the spindle.

Figs. 4 and 5 are front views of two modifications.

Fig. 6 is an elevational View of a shuttle-carrier for an open straight shuttle, and of a shuttle.

Fig. '7 is a corresponding horizontal view.

Fig. 8 represents a modification of the roller.

Figs. 9, 10 and. 11 are views, analogous to Figs. 50 1, 2 and 3, of a modification in which the roller is replaced by an elastic buffer.

Figs. 12, 13 and 14 are partial plan, front and side views of a modification of said elastic buffer.

Figs. 15 and 16 are partial front and side views 5 of another modification.

In the form of construction represented in Figs. 1 to 3, the shuttle-carrier I has a known form; it is intended to be secured by a screw passing through the hole 2 to the usual reciprocating support not represented of the shuttle-carrier. In 5 the guide 3 (Fig. 3) is formed a groove 3' along which the needle is displaced.

Adjacent the rear end 5 of the shuttle 4, the shuttle-carrier I is provided with a piece 6 forming a buffer, of a general circular form and of 10 such diameter that it may engage slightly, at its rounded edges, in the cylindrical shuttle 4.

In the buffer a is screwed a rod 8 which is slidable in the end 9 of the shuttle-carrier I. A coiled spring II is disposed, around the rod 8, between 15 the buffer 6 and the part 9 of the shuttle-carrier I.

The buffer 6 is provided with a lateral stud I2 which is slidable in an aperture I3 (Fig. 3) formed in the shuttle-carrier.

I At the top of the shuttle-carrier I, the end 9 20 is preferably provided with a plate l4, the end portion of the free edge of said plate adjacent the point in being substantially situated just above the faces in contact of the shuttle 4 and of the buffer 6". 25

The buffer 6 is preferably provided at its lower part with a projection 8 (Fig. 2) which serves to prevent the loop of thread of the needle from extending farther than the buffer. On the face of the buffer 6 which is disposed adjacent to the shuttle 4, the buffer includes, at its centre, a small bearing recess I5, in which a journal point I6 (Fig. 3) mounted on the spindle I1 is adapted to be engaged. This spindle IT has a length such 35 that the journal point I6 is engaged in the bearing recess 25, the opposite journal point [8 being engaged inthe bearing recess I9 carried by the shuttle 4.

The shuttle carrier I is provided upon its rear 40 surface with a spring strip 2| which has one end secured toward the rear end of the shuttle to said carrier by means of rivets similar to 2D or by other suitable means. Upon the other end of said spring strip, the spindle 22 of a roller 23 is rotat- 45 ably mounted, the outer surface or periphery of said roller being formed with small longitudinal grooves or teeth which are not sharp but have smooth edges. These grooves or teeth may have any form, depth and spacing desired.

The roller 23 is engaged in a slot 24 in the shuttle-carrier I, so as to bear upon the point 20 of the shuttle 4 (Fig. 3). This shuttle 4 comprises a recess 25'forminga roller race for the roller 23, and thus the shuttle is urged regularly against 55 vex bearing surface.

The shuttle-carrier is preferably completed by a lever 26 termed shuttleraiser.

Since the shuttle is constantly urged in the direction of the arrow f (Fig. 3) by the buffer 6, subjected to the action of the spring I I, the point 20 is well applied against the surface 3 of the guide. The shuttle is thus perfectly maintained, and in an elastic manner. It receives no shocks during its operation. In fact, when the shuttlecarrier I oscillates in the direction of the arrow (Fig. 3), if on account of speed or friction, the shuttle 4 should tend to be displaced with reference to the shuttle-carrier in the direction contrary to the arrow f it is maintained in an elastic manner, at one end by the buffer 6, and at the other end by the roller 23 which rolls upon the surface 25 during the passage of the thread of the needle. When the shuttle 4 moves from left to right (Fig. 3), the pointed end 23 of the shuttle 4 is urged against the guide 3 by the spring 2I and by the roller 23, so that, when said pointed end 20 is opposite the groove 3, the thread of the needle is caused to pass upon the side of the pointed end 29 of the shuttle which is out of contact with guide 3. When the shuttle moves further towards the right, the needle thread is guided between roller 23 and shuttle.

4 so as to pass from the right side to the left side of said roller 23. While sliding along the shuttle, the needle thread comes into contact with the plate I4 and is guided by said plate between the rear end 5 of the shuttle 4 and the buffer 6 and swings said buffer slightly in order to pass between said buffer and the journal point I6 of the spindle II. The projection 6 prevents the thread from passing beyond the buffer 6 towards the left. The thread slides further on the buffer 6 and swings again slightly said buffer in order to pass between said buffer and the rear end of the shuttle near the guide 3.

The shuttle is always perfectly pressed at its point 20 against the guide 3. Thus there is no danger of a loss of stitches which would take place if a play existed between the guide 3 and the said point 20.

On the other hand, in the case of cylindrical shuttles, the spindle I'I turns constantly at both ends in the bearing recesses I5 and I9, the buffer 6 remaining always applied in an elastic manner against the open end of the shuttle 4 and hence receiving no shocks.

It should also be observed that the roller 23 makes easier the passage between the shuttle and the shuttle-carrier of the loop of thread formed by the needle and in which the point 20 of the shuttle is engaged, even if it should be smooth upon the rolling periphery, this passage being still easier if this periphery is grooved, as represented. The thread, being engaged in a groove, obliges the roller to turn, and becomes disengaged, while the roller and the shuttle have not interrupted their contact.

At the rear end, the disengagement of the loop is facilitated by the plate I4 of the shuttlecarrier I and by the projection 6 of the buffer 6, and these parts, which hold the loop between the buffer and the shuttle, prevent all catching. This buffer has a slight lateral play, and in consequence, when the thread is engaged between the bufier and the shuttle on the upper side of Fig. 3 said buffer is still in contact with the shuttle on the lower side of Fig. 3, and when the thread comes to the lower side, the buffer and the shuttle are already in contact on the upper side. Thus there will be no play, and hence no shocks.

In Fig. 4 is represented a modification in which the buffer 8 comprises at the rear two guiding tongues I 2 fonning a sort of fork which is displaced upon the shuttle-carrier I, provided with suitable notches I2. As in the preceding embodiment, the buffer 6 is provided at its lower part with a projection 6 having the same purpose as projection G in Fig. 2. Moreover, the tongues I2 serve to guide the buffer on the shuttle carrier and also to guide the needle thread between the rear end of the shuttle and the buffer.

On the other hand, the roller 23 comprises a concave part which is smooth or grooved, and thus it fits upon the form of the point 28 of the shuttle, and it is not necessary to provide a recess 25 as in the preceding example.

In Fig. 5 is represented another modification, in which the buffer 5 slides in the end 9 of the shuttle-carrier I, the rod 8 sliding in a member 9 secured to the said end 9.

In Figs. 6 and 7 is represented a modification in the case of a machine having a straight open shuttle.

As observed, the spindle I7 is pivoted at each end in the shuttle 4', and no longer makes contact with the buifer 6 The journal point I6 of the spindle I1 is engaged in a bearing recess 33 in the rear end of the shuttle, while the journal point I3 of said spindle II is engaged in a bearing recess 39 of a push-piece or member 40, which is guided in the pointed end of the shuttle and urged toward said point I8 by a spring M. The buffer 6 forms a point 6' entering a small bearing recess 6" provided in the rear end of the shuttle.

On the other hand, the spring 2I carrying the roller 23, whose cylindrical surface is grooved, is situated between the shuttle-carrier I and the shuttle 4', since nothing must project beyond the external face of the shuttle-carrier.

In the case of a vibrating machine with open shuttle, the buffer 6 should have the same form.

In Fig. 8 is represented a modified form of roller made in two pieces 23 23 without spring strip. The two pieces 23 -23 turn upon an axle 22 mounted directly on the shuttle-carrier I. These pieces are pushed togetherby two coiled springs 2I2I' mounted on the axle 22 between the outer parts of the roller and the fork of the shuttle-carrier. The pieces 23 -23 are preferably provided with small grooves or teeth on their surface of revolution.

According to the modification represented in Figs. 9 to 11, at the end next the point of the shuttle 3, the shuttle-carrier I is provided with a buffer 23 having two wings which are adapted to fit upon the form of the point of the shuttle. This buffer 23 which constantly pushes the shuttle against the guide, is movable in the shuttle-carrier, by means of two end-parts 3E and 3|. Fne end part 353 is formed, for example, by the upturned end of the buffer 23 As to the endpart 3I, it is secured to the buffer. A spring 32 is placed around the end-part SI between the shuttle-carrier and the buffer, On the other hand, a pin 33 mounted on the end-part 3| holds the buifer upon the shuttle-carrier.

As the shuttle is always perfectly applied by its point 20 against the guide 3, there will be no danger of a loss of stitches which would take place if a play existed between the guide 3 and the said point 20. I 1

In Figs. 12 to 14, is represented a modification in which the buffer 23 is mounted on the rear face of the shuttle-carrier, and two wings 23' of this buffer project from the front face.

The buffer is guided by a screw 34 which is screwed into the end of the shuttle-carrier l, and by two projections 35 which are formed in one with the shuttle-carrier and are obtained by punching and bending. A spring 32 is interposed between the buffer 23 and the head of the screw 34.

In Figs. 15 and 16, is represented another modification, in which the simple buffer of the two preceding examples is replaced by two buffers l3 and 23 which have an inclined position in such way that their axes intersect at 0 in front of the shuttle-carrier.

Each of these buffers is provided with an endpart, each of which parts is slidable in one of the two inclined wings 3B of the shuttle-carrier l.

A spring 32 is mounted between each buffer and the corresponding wing 36.

The end-part of each buffer ends in an enlarged part 31 which holds the buffer in place upon the shuttle-carrier.

Obviously, the invention is not limited to the form of construction herein represented and described, these being given solely by way of example. The roller of the device shown in Fig. 8 may consist of three or four pieces, or more. The slot of the shuttle-holder in which the roller is located may in fact have the form of .a large aperture.

Having now described my invention what I claim as new and desire to secure by Letters Patent is:

1. In a sewing machine, in combination a shuttle carrier adapted to be reciprocated, a shuttle adapted to be mounted on said shuttle carrier and having a pointed forward end, a guiding surface for said shuttle on which the pointed end of said shuttle is adapted to bear, retaining means carried at the front of said shuttle carrier and adapted to cooperate with said guiding surface in order to hold said pointed end of the shuttle between said retaining means and said guiding surface, guiding means on said shuttle carrier adapted to cooperate with the rear end of the shuttle and adapted to maintain said rear end of the shuttle in a determined relative position with respect to said shuttle carrier, and elastic means adapted to urge constantly said guiding means against said rear end of the shuttle and consequently to urge said shuttle longitudinally towards said retaining means, whereby the shuttle is maintained with its pointed end applied against said guiding surface and with its rear end guided by said guiding means.

2. In a sewing machine, in combination, a shuttle-carrier adapted to be reciprocated, a hollow shuttle adapted to be mounted on said shuttlecarrier, and having a pointed forward end and an open rearward end, a guiding surface for said shuttle on which the pointed end of said shuttle is adapted to bear, retaining means carried at the front of said shuttle-carrier and adapted to cooperate with said guiding surface in order to hold said pointed end of the shuttle between said retaining means and said guiding surface, a buffer guided on said shuttle-carrier and provided with guiding means adapted to cooperate with the open rearward end of said shuttle and to maintain the adjacent faces of said buffer and of said shuttle in a determined relative position, and elastic means adapted to urge constantly said buffer and said shuttle longitudinally toward said .retaining means, whereby the shuttle is maintained with its pointed end applied against said guiding 5 surface and with its rear end guided by said buffer.

3. In a sewing machine according to claim 2, guiding means provided on said buffer and adapted to guide the loop of thread of the needle between said buffer and said shuttle. 10

4. In a sewing machine according to claim 2, guiding means provided on the rear of said shuttle-carrier and adapted to guide the loop of thread of the needle between the buffer and the shuttle.

5. In a sewing machine according to claim 2, guiding means provided on said buffer and on the rear of said shuttle-carrier and adapted to guide the loop of thread of the needle between the buffer and the shuttle.

6. In a sewing machine, in combination, a shuttle-carrier adapted to be reciprocated, a hollow shuttle adapted to be mounted on said shuttlecarrier, having a pointed forward end and an open. rearward end and provided with a bearing recess on its inner forward face, a guiding surface for said shuttle on which the pointed end of said shuttle is adapted to bear, retaining means carried at the front of said shuttle-carrier and adapted to cooperate with said guiding surface in order to hold said pointed end of the shuttle between said retaining means and said guiding surface, a spindle adapted to be introduced into said shuttle and provided with journal points at its forward and rearward ends, the forward journal point being adapted to be engaged into said bearing recess provided on the inner forward face of said shuttle, a buffer guided on said shuttle carrier and provided with guiding means adapted to cooperate with the open end of said shuttle and to maintain the adjacent faces of said buffer and of said shuttle in a determined relative position, the buffer being also provided with a bearing recess into which the rearward journal point of said spindle is adapted to be engaged, and elastic means adapted to urge constantly said buffer and said shuttle longitudinally towards said retaining means, whereby the shuttle is maintained with its pointed end applied against said guiding surface and with its rear end guided by said buffer.

7. In a sewing machine according to claim 1, 50 the further feature consisting in that said retaining means comprises at least a roller bearing on the pointed end of the shuttle.

8. In a sewing machine according to claim 1, the further feature consisting in that the retain- 55 ing means includes at least one roller provided at its periphery with grooves parallel to the axis of said roller and bearing on the pointed end of the shuttle.

9. In a sewing machine according to claim 1, 60 the further feature consisting in that said retaining means comprises at least a roller bearing on said pointed end of said shuttle, and a spring adapted to press said roller toward said pointed end of said shuttle. 5

10. 'In a sewing machine according to claim 1, the further feature consisting in that said retaining means comprises at least a roller having a concave rolling surface adapted to fit upon the form of said pointed end of the shuttle.

11. In a sewing machine according to claim 2, the further feature consisting in that said buffer isprovided with at least a lateral stud adapted to slide in an aperture formed in the shuttle carrier and with a depending projection at its 7 lower part, whereby the loop of thread of the needle is prevented from extending farther than the buifer.

12. In a sewing machine according to claim 2, the further feature consisting in that the rear of said shuttle carrier is provided at its upper part with a guiding surface extending substantially above the rear end of said shuttle.

13. In a sewing machine according to claim 2, the further feature consisting in that said buffer is provided with two lateral tongues forming a sort of fork and adapted to pass through said shuttle carrier and to be guided on said shuttle carrier, said buffer being also provided with a depending projection at its lower part, whereby the loop of thread of the needle is prevented from extending farther than the buffer.

14. In a sewing machine, in combination a shuttle carrier adapted to be reciprocated, a hollow shuttle adapted to be mounted on said shuttle carrier and having a pointed forward end and a closed rearward end, a guiding surface for said shuttle on which the pointed end of said shuttle is adapted to bear, retaining means carried at the front of said shuttle carrier and adapted to cooperate with said guiding surface in order to hold said pointed end of the shuttle between said retaining means and said guiding surface, a buffer guided on said shuttle carrier and provided with guiding means adapted to cooperate with the closed rearward end of said shuttle and to maintain the adjacent faces of said buffer and of said shuttle in a determined relative position, and elastic means adapted to urge constantly said buffer and said shuttle longitudinally toward said retaining means, whereby the shuttle is maintained with its pointed end applied against said guiding surface and with its rear end guided by said buffer.

15. In a sewing machine according to claim 14, the further feature consisting in that said guiding means on said bufier is formed by a pointed projection of said buffer adapted to be engaged in 20 a bearing recess formed in said rearward end of said shuttle.

JULES FRANCOIS LEON GIRAUD. 

